pink pigmented

Edge evidence

• isoprenoid precursors feed into carotenoid biosynthesis

  Isoprenoid precursors provide substrate for carotenoid production.

  • DOI:10.1016/j.gene.2004.11.038 isoprenoid precursor biosynthesis Supports isoprenoid precursor biosynthesis as an upstream step in eubacterial carotenoid pathways.
• Crt enzymes catalyzes carotenoid biosynthesis biolink:catalyzes

  Crt enzymes catalyze reactions in carotenoid biosynthesis.

  • DOI:10.1080/1040841X.2025.2526423 crt genes ... reactions they catalyze Supports Crt enzymes as pathway catalysts.
• carotenoid biosynthesis produces pink carotenoids METPO:2000202

  Carotenoid biosynthesis can produce pink bacterial pigments.

  • DOI:10.1080/1040841X.2025.2526423 pink ... pigmentation in bacteria Supports carotenoids as one source of pink bacterial pigmentation.
• pink carotenoids causes visible pink color biolink:causes

  Pink carotenoids cause visible pink pigmentation.

  • DOI:10.1080/1040841X.2025.2526423 responsible for the red, pink, orange, and yellow pigmentation Supports the color-producing role of carotenoid pigments.
• visible pink color manifests as pink pigmented METPO:2007400

  Visible pink color manifests the pink-pigmented phenotype.

  • DOI:10.1080/1040841X.2025.2526423 pink ... pigmentation in bacteria Supports trait-level pink pigmentation from bacterial carotenoids.
• lycopene precursor of pink carotenoids

  Lycopene is the central precursor converted into colored downstream carotenoid pigments.

  • DOI:10.3390/biology12101346 Sandmann review: lycopene is the central carotenoid intermediate from which colored carotenoid pigments are formed via crt pathway reactions.
• carotenoid biosynthesis feeds from lycopene

  Carotenoid biosynthesis proceeds through lycopene toward colored carotenoid products.

  • DOI:10.3390/biology12101346 crtI/phytoene desaturase generates lycopene as a committed colored-carotenoid intermediate in the biosynthetic pathway.
• Crt enzymes part of photosynthesis gene cluster biolink:part_of

  crt carotenoid genes are part of photosynthesis gene clusters in phototrophic bacteria.

  • DOI:10.3390/biology12101346 "the genes of the carotenoid pathways are part of photosynthesis gene clusters" (Sandmann 2023).
• photosynthesis gene cluster contributes to visible pink color RO:0002326

  Carotenoid genes embedded in photosynthesis gene clusters contribute to visible pigmentation.

  • DOI:10.3390/biology12101346 "The pigmentation of purple bacteria is caused by a combination of bacteriochlorophylls and carotenoids" with crt genes in PGCs.
• oxygen upregulates crtI-crtB operon

  Oxygen availability upregulates the carotenoid biosynthetic operon, an environmental regulator of pigment output.

  • DOI:10.3390/biology12101346 "oxygen up-regulates the crtI-crtB operon" (Sandmann 2023), making oxygen a causal environmental regulator of pigmentation.
• crtI-crtB operon catalyzes carotenoid biosynthesis biolink:catalyzes

  The crtI-crtB operon encodes enzymes carrying out carotenoid biosynthetic reactions.

  • DOI:10.3390/biology12101346 crtB (phytoene synthase) and crtI (phytoene desaturase) catalyze committed steps producing colored carotenoids.